|
Schedule of Fair Value of Fixed Maturities and Equity Securities (Detail) (USD $)
In Thousands, unless otherwise specified
|
Sep. 30, 2012
|
Dec. 31, 2011
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
$ 2,878,625 |
$ 2,682,142 |
| Equity securities available for sale, fair value |
37,453 |
36,689 |
| Fair value |
2,916,078 |
2,718,831 |
| Percent of total |
100.00% |
100.00% |
|
Priced from external pricing services
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
2,788,286 |
2,606,714 |
| Equity securities available for sale, fair value |
9,445 |
9,660 |
|
Priced from independent broker quotations
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
38,547 |
31,669 |
|
Priced from internal matrices and calculations
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
51,792 |
43,759 |
| Equity securities available for sale, fair value |
28,008 |
27,029 |
|
Level 1
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
36,471 |
24,097 |
| Equity securities available for sale, fair value |
2,172 |
2,216 |
| Fair value |
38,643 |
26,313 |
| Percent of total |
1.00% |
1.00% |
|
Level 1 | Priced from external pricing services
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
36,471 |
24,097 |
| Equity securities available for sale, fair value |
2,172 |
2,216 |
|
Level 2
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
2,790,362 |
2,614,286 |
| Equity securities available for sale, fair value |
34,072 |
33,350 |
| Fair value |
2,824,434 |
2,647,636 |
| Percent of total |
97.00% |
97.00% |
|
Level 2 | Priced from external pricing services
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
2,751,815 |
2,582,617 |
| Equity securities available for sale, fair value |
7,273 |
7,444 |
|
Level 2 | Priced from independent broker quotations
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
38,547 |
31,669 |
|
Level 2 | Priced from internal matrices and calculations
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Equity securities available for sale, fair value |
26,799 |
25,906 |
|
Level 3
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
51,792 |
43,759 |
| Equity securities available for sale, fair value |
1,209 |
1,123 |
| Fair value |
53,001 |
44,882 |
| Percent of total |
2.00% |
2.00% |
|
Level 3 | Priced from internal matrices and calculations
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Fixed maturity securities available for sale, carrying value |
51,792 |
43,759 |
| Equity securities available for sale, fair value |
$ 1,209 |
$ 1,123 |